SUPPLEMENTARY RESTRAINT SYSTEM (SRS) ......................................... 4

Set + Switch

A constant battery feed is supplied to the rotary coupler (C0082) via the horn relay (C0576) on a PY wire. Current flows across the rotary coupler (C1254) to the cruise control switches. The 'Set +' switch is a normally open, non-latching switch. When the switch is pulled forward, the switch contacts close. Current flows across the switch back to the rotary coupler. The rotary coupler (C0082) is connected to the cruise control interface unit (C1959) by an RW wire.

The interface unit (C1959) converts the signals received from the 'Set +' switch, and relays information to the Engine Control Module (ECM) (C0331) on an RG wire. The signal provided by the interface unit is a continuous, pulsed voltage, varying from approximately 6 V to 8 V. By measuring the frequency of the pulses, the ECM is able to control vehicle speed in accordance to requests from the 'Set +' switch.

Res switch

A constant battery feed is supplied to the rotary coupler (C0082) via the horn relay (C0576) on a PY wire. Current flows across the rotary coupler (C1254) to the cruise control switches. The 'Res' switch is a normally open, non-latching switch. When the switch is pulled forward, the switch contacts close. Current flows across the switch back to the rotary coupler. The rotary coupler (C0082) is connected to the cruise control interface unit (C1959) by a UW wire.

The interface unit (C1959) converts the signals received from the 'Res' switch, and relays information to the ECM (C0331) on an RG wire. The signal provided by the interface unit is a continuous, pulsed voltage, varying from approximately 6 V to 8 V. By measuring the frequency of the pulses, the ECM is able to control vehicle speed in accordance to requests from the 'Res' switch.

Brake Pedal Switch

Fuse 35 of the passenger compartment fuse box (C0580) provides an ignition feed to the hall effect brake pedal switch (C0652) on a W wire. The brake pedal switch (C0652) is earthed on a B wire.

When the brake pedal is in the rest position, only a nominal voltage (between approximately 0V and 2V) is supplied to the ECM (C0331) on GR and PG wires. When the brake pedal is pressed, this voltage rises to between approximately 6V and battery voltage. Sensing this increase, the ECM suspends cruise control operation.

Electronic Automatic Transmission (EAT) ECU

When cruise control is active, the cruise control interface unit (C1959) provides a feed to the EAT ECU (C0932) on a WU wire. When the EAT ECU receives this feed, it enters its cruise control mode. For more information on EAT operation, refer to the Electronic Automatic Transmission (EAT) – 02MY section of this manual. + ELECTRONIC AUTOMATIC TRANSMISSION (EAT) – 02MY.

Instrument Pack

When cruise control is operational, the cruise control interface unit (C1959) sends a 'cruise active' message to the instrument pack (C0230) via the CAN-BUS on YN (low) and YB (high) wires. This message is used to illuminate the cruise control lamp housed within the instrument pack.